Document and Entity Information	Sep. 30, 2019
Prospectus:
Document Type	497
Document Period End Date	Sep. 30, 2019
Entity Registrant Name	VIRTUS OPPORTUNITIES TRUST
Entity Central Index Key	0001005020
Entity Inv Company Type	N-1A
Amendment Flag	false
Document Creation Date	Dec. 18, 2020
Document Effective Date	Dec. 18, 2020
Prospectus Date	Jan. 28, 2020
Virtus Duff & Phelps Global Infrastructure Fund \| Class R6
Prospectus:
Trading Symbol	VGIRX
Virtus Duff & Phelps Global Infrastructure Fund \| Class I
Prospectus:
Trading Symbol	PGIUX
Virtus Duff & Phelps Global Infrastructure Fund \| Class C
Prospectus:
Trading Symbol	PGUCX
Virtus Duff & Phelps Global Infrastructure Fund \| Class A
Prospectus:
Trading Symbol	PGUAX
Virtus Duff & Phelps Global Real Estate Securities Fund \| Class R6
Prospectus:
Trading Symbol	VRGEX
Virtus Duff & Phelps Global Real Estate Securities Fund \| Class I
Prospectus:
Trading Symbol	VGISX
Virtus Duff & Phelps Global Real Estate Securities Fund \| Class C
Prospectus:
Trading Symbol	VGSCX
Virtus Duff & Phelps Global Real Estate Securities Fund \| Class A
Prospectus:
Trading Symbol	VGSAX
Virtus Duff & Phelps International Real Estate Securities Fund \| Class I
Prospectus:
Trading Symbol	PXRIX
Virtus Duff & Phelps International Real Estate Securities Fund \| Class C
Prospectus:
Trading Symbol	PXRCX
Virtus Duff & Phelps International Real Estate Securities Fund \| Class A
Prospectus:
Trading Symbol	PXRAX
Virtus Duff & Phelps Real Estate Securities Fund \| Class R6
Prospectus:
Trading Symbol	VRREX
Virtus Duff & Phelps Real Estate Securities Fund \| Class I
Prospectus:
Trading Symbol	PHRIX
Virtus Duff & Phelps Real Estate Securities Fund \| Class C
Prospectus:
Trading Symbol	PHRCX
Virtus Duff & Phelps Real Estate Securities Fund \| Class A
Prospectus:
Trading Symbol	PHRAX
Virtus KAR Emerging Markets Small-Cap Fund \| Class R6
Prospectus:
Trading Symbol	VRESX
Virtus KAR Emerging Markets Small-Cap Fund \| Class I
Prospectus:
Trading Symbol	VIESX
Virtus KAR Emerging Markets Small-Cap Fund \| Class C
Prospectus:
Trading Symbol	VCESX
Virtus KAR Emerging Markets Small-Cap Fund \| Class A
Prospectus:
Trading Symbol	VAESX
Virtus KAR International Small-Cap Fund \| Class R6
Prospectus:
Trading Symbol	VRISX
Virtus KAR International Small-Cap Fund \| Class I
Prospectus:
Trading Symbol	VIISX
Virtus KAR International Small-Cap Fund \| Class C
Prospectus:
Trading Symbol	VCISX
Virtus KAR International Small-Cap Fund \| Class A
Prospectus:
Trading Symbol	VISAX
Virtus KAR International Small-Mid Cap Fund \| Class I
Prospectus:
Trading Symbol	VKIIX
Virtus KAR International Small-Mid Cap Fund \| Class C
Prospectus:
Trading Symbol	VKICX
Virtus KAR International Small-Mid Cap Fund \| Class A
Prospectus:
Trading Symbol	VKIAX
Virtus KAR International Small-Mid Cap Fund \| Class R6
Prospectus:
Trading Symbol	VKIRX
Virtus Vontobel Emerging Markets Opportunities Fund \| Class R6
Prospectus:
Trading Symbol	VREMX
Virtus Vontobel Emerging Markets Opportunities Fund \| Class I
Prospectus:
Trading Symbol	HIEMX
Virtus Vontobel Emerging Markets Opportunities Fund \| Class C
Prospectus:
Trading Symbol	PICEX
Virtus Vontobel Emerging Markets Opportunities Fund \| Class A
Prospectus:
Trading Symbol	HEMZX
Virtus Vontobel Foreign Opportunities Fund \| Class R6
Prospectus:
Trading Symbol	VFOPX
Virtus Vontobel Foreign Opportunities Fund \| Class I
Prospectus:
Trading Symbol	JVXIX
Virtus Vontobel Foreign Opportunities Fund \| Class C
Prospectus:
Trading Symbol	JVICX
Virtus Vontobel Foreign Opportunities Fund \| Class A
Prospectus:
Trading Symbol	JVIAX
Virtus Vontobel Global Opportunities Fund \| Class R6
Prospectus:
Trading Symbol	VRGOX
Virtus Vontobel Global Opportunities Fund \| Class I
Prospectus:
Trading Symbol	WWOIX
Virtus Vontobel Global Opportunities Fund \| Class C
Prospectus:
Trading Symbol	WWOCX
Virtus Vontobel Global Opportunities Fund \| Class A
Prospectus:
Trading Symbol	NWWOX
Virtus Vontobel Greater European Opportunities Fund \| Class I
Prospectus:
Trading Symbol	VGEIX
Virtus Vontobel Greater European Opportunities Fund \| Class C
Prospectus:
Trading Symbol	VGECX
Virtus Vontobel Greater European Opportunities Fund \| Class A
Prospectus:
Trading Symbol	VGEAX

Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.

No definition available.

Name:	dei_AmendmentFlag
Namespace Prefix:	dei_
Data Type:	xbrli:booleanItemType
Balance Type:	na
Period Type:	duration

- Definition

The date the document was made available and submitted, in CCYY-MM-DD format. The date of submission, date of acceptance by the recipient, and the document effective date are all potentially different.

+ References

No definition available.

+ Details

Name:	dei_DocumentCreationDate
Namespace Prefix:	dei_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The date when a document, upon receipt and acceptance, becomes officially effective, in CCYY-MM-DD format. Usually it is a system-assigned date time value, but it may be declared by the submitter in some cases.

+ References

No definition available.

+ Details

Name:	dei_DocumentEffectiveDate
Namespace Prefix:	dei_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.

+ References

No definition available.

+ Details

Name:	dei_DocumentPeriodEndDate
Namespace Prefix:	dei_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.

+ References

No definition available.

+ Details

Name:	dei_DocumentType
Namespace Prefix:	dei_
Data Type:	dei:submissionTypeItemType
Balance Type:	na
Period Type:	duration

- Definition

A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation 12B
-Number 240
-Section 12
-Subsection b-2

+ Details

Name:	dei_EntityCentralIndexKey
Namespace Prefix:	dei_
Data Type:	dei:centralIndexKeyItemType
Balance Type:	na
Period Type:	duration

- Definition

One of: N-1A (Mutual Fund), N-1 (Open-End Separate Account with No Variable Annuities), N-2 (Closed-End Investment Company), N-3 (Separate Account Registered as Open-End Management Investment Company), N-4 (Variable Annuity UIT Separate Account), N-5 (Small Business Investment Company), N-6 (Variable Life UIT Separate Account), S-1 or S-3 (Face Amount Certificate Company), S-6 (UIT, Non-Insurance Product).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-T
-Number 232
-Section 313

+ Details

Name:	dei_EntityInvCompanyType
Namespace Prefix:	dei_
Data Type:	dei:invCompanyType
Balance Type:	na
Period Type:	duration

- Definition

The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation 12B
-Number 240
-Section 12
-Subsection b-2

+ Details

Name:	dei_EntityRegistrantName
Namespace Prefix:	dei_
Data Type:	xbrli:normalizedStringItemType
Balance Type:	na
Period Type:	duration

- Definition

Trading symbol of an instrument as listed on an exchange.

+ References

No definition available.

+ Details

Name:	dei_TradingSymbol
Namespace Prefix:	dei_
Data Type:	dei:tradingSymbolItemType
Balance Type:	na
Period Type:	duration

- Definition

The date of the prospectus.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form
-Number N-1A
-Chapter A
-Section 1
-Subsection a
-Paragraph 3

+ Details

Name:	rr_ProspectusDate
Namespace Prefix:	rr_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Prospectus Table.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form
-Number N-1A
-Chapter A

+ Details

Name:	rr_ProspectusTable
Namespace Prefix:	rr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration